Furnace.



PATENTED FEB. 5, 1907.

W. N. BEST. FURNACE.

APPLICATION FILED APK.8.1903.

In 0822 lb)": willz'am fiwzan Best III. is a horizontal section on the line Ill Ill UNITED STATES JOHN H. BEST AND EZR IBATIEI ".I UFITICE s, CALIFORNIA, ASSIGNOR To A BEST, OF QUINCY, ILLINOIS.

FURNACE,

Specification of Letters Patent.

Patented Feb. 5, 1907- Anplioation filed April 8.1903. Serial No. 151.632.

To all whom it may cancer/1 Be it known that 1, WILLIAM NEWTON BEST, a citizen of the United States, residing at Los Angeles, in the county of Los Angelcs and State of California, have invented new and useful Improvements in l urnaces, of which the following is a specification.

This invention relates to a furnace for 3 heating locomotives and stationary boilers and for other purposes.

While the invention is applicable to va' rious kinds of furnaces, it is specially adapted for the furnaces of locomotive-engines.

The main object of this invention is to provide a durable and eilicient arch construction for coal-burning boiler-furnaces whlch will withstand the heat and the mechanical strains of locomotive use, while maintaining substantially the full hcat-apsorbtive ca-- pacity of the firebox or furnace-wails.

Another object of my invention is to provide an arch of this nature that may be set. up, removed, and repaired with a minimum of trouble and expense.

A further object of my invention is to provide such an arch with means whereby cinders or solid combustion products or combustible material carried over and deposited back of the arch may be returned to the main combustion-chamber and the entrance to the boiler-flues kept clear and open.

An additional object of my invention is to provide an arch with airsup vly means whereby air will be supplied .to t to interior of the combustion-chainher at the most desirable point; and a further object is to provide a force draft for such air-supply means.

The accompanying drawings illustrate my invention applied to the firebox of a locomotive-boiler.

Figure I is a vertical section of the on the line I I in Fig. II. verse section on the line II fire-ho}: Fig. II is a trans- II .lll Fig. I. Fig.

'13 is substantially in Fig. I. Fig IY is a perspective view of one of the foundations or auchor-ln'icks for l the arch. Figs. V and VI are rear and front perspective views of the forward. arch-section. Fig VII is a side view of one of the main arch-scctions Fig. VIII is the rear end of the firebox bottom. is a longitudinal section of a form of niinal arch-section different from that shown in Fig. I.

a plan of the ter- 5 rear. The front arch-section 11, being 1 designates the fire-box of a locomotiveholler, or generally the casing or shell of the coinlmstion-cha1nber of a furnace, said firebox bong surrounded by the water-leg 2 and having lire-aloor l, grate t, and dro )-grate 5. Ihe ash-pan 6 below the fire-box lias front and rear dampers or doors 7 7. Boiler-tubes a open in the usual manner from the rear of the fire-box.

At the rear of the drop-grate 5 is provided a shelf or closure part having a central grate portion 8, with seats orsockets 9 9 on each side thereof for receiving and supporting foundation or anchor blocks or bricks 10, which tit into said sockets and are thereby held against lateral or longitudinal movement. The tops of these anchor-blocks are inclined upwardly and rearwardly and an arch-section 11., with .siniilally-inclined bottom and stop, is placed on these foundation bricks. or blocks, so as to span the front end of the main combustion-elmmber. On its front side this arch-section has at each end a tug or projection 12, that when the arch-section is put in place rests against thefront wall of the tire-box and holds the body or central part of the arch-scction away from such wall, thereby forming a passage 13, leading from the space over and back of the arch to the main comluistion-clnunber. The inner faces of the projections are inclined substantially from the upper outer corners inward and downward, so that the opening hopper or V shaped, which will permit the cinders to enter at all points from the entire width of the arch without any shoulders or points for them to accumulate and will then direct them H the central portion of the grate, where the will be consumed by the intense heat, and at the same time a good broad support is secured by the substantially triangular lugs for the weight of the inclined arch.

()n the side walls or sheets i l of the .n'rebox are formed, riveted, or secured a series of lugs, studs, pins, or projections 15, that engage with the rcspeetivi arch-sgctions 11 16 l7 IS, the ;1 reh-sections having grooves 19 in their ends that receive these studs, and said grooves being parallel to the inclined top and bottom faces of these sections, so that said secti ns can he slid over these studs from the supported mainly by the anchor-bricks 10, a

ICC

of these sections 16 17 18 are provided with conduits or passages 22-, extending longitudinally through the same and parallel to their inclined top and bottom faces, and the front Section 11 is provided with passages 23, extending from its front face in line with passages 22 and downwardly in line with vcrti" cal passages 24 in the anchor-bricks 8, and with holes 25 in the seats 9, these passages or holes 25co1nmunicating with the ashpan 6. Said passages 25 24 23 form continuous conduits forthe passage of air from the ashpan to the rear or top end of the arch, and by makin themffan-shaped as they extend towardtlie top of the arch, as shown in dotted lines in. Figs. 11 and ill, the air is delivered to the flames inv a wide sheet extending substantially across the Width of the furnace, thereby producing the most satisfactory result. Blast-pipes 26 for air or steam may be provided, extending through each of the holes or passages 25 and having a sup-ply connection controlled by a valve-27. The conduits or passages 22 in the rearmost or end arch-section 18 may extend directly out at the end of such section, as indicated in Figs. I and H, or it may be directed obliquely downward, as shown in Fig. IX, or in any other-direction that may be found desirable.

The arch-sections and anchor briclts are a l desirably madeof fire-brick or similar refractory material coated with carborundum or other material more refractorythan fire- Ibrick, as indicated at 7). Such material is necessarily com aratiyely weak and subject tobreaka e an wear, and IIlY'iIlVIltiOIl has the speciad advantage that it enables an arch of such material to be supported' with a minimum strain on the refractory material, as th e arch-sections are supported'by direct vertical engagement at each end without overhang such as would expose the material to a bending Strain. At the same time this improved construction allows the full exposure of the side sheets or walls of the iire-box to the heat ofthe combustion-chaniber, as there are no foundation or side walls of refiactory heatinsul'ating material below the ends of the arch to screen tlte said side sheets from the fire. These arch sections are desirably formedof single pieces of fire brick, arcled, as shown, thereby giving a construction of maximum strain and minimum weight. The'use of a plurality of sections not only l l l l i i l g l l facilitates setting up and repairing of the arch, but prevent-s undue strain being brought on any part of the arch material. Each arch-section being integral and extending from side to side of the fire-box its weight is brought directly downward on the sup porting'projections witltout any side thrust such as would arise with an arch made with one or more breaks or joints between the ends. Tie air-draft tlrougii passages 22 in these arch-sections keeps down tie temperature of tie arch material to some extent, thereby in- .-r easing t? e durability of ti 0 structure, and such air draft is delivered in a highlycatcd condition to tie interior of thecombustion-ci amber at tie point Where it is most ell'ectivc-namely, at the point wiere t. e flame is deflected by ti o arch. ing of tie partially-consumed substances and and of ti e hot air is aided both by t-llE draft or velocity of tie air and by tie Tire mixmovement of said substances and gases transversely to said draft. I

Tie object of providing the passage 13 between tle arch, and t e front of tie fire-box is to allow any materia-Lsuch as Cinders, that is carried over and settles back of the archto fall down ti rough tl is passage ontotlte rear grate-space 8,,wl'ere any part of it that is combustible will he burned,wl ile the rest aecumulates or is discl: arged through the grateopenrngs into the ash-pan. If passage 13 were not provided, the space back or the arch would soon fill up with such material,,

tlrerebyclogging or blocking the entrances to the boiler-tubes a. Bycoating the fire-brick arch-sections and anchor-bricks with car borundum I add greatly to the durability of the structure, as carberundurn is much more refractory than fire-brick. p

In cases of needed repair a furnace of this construction can be made ready foruse by simply replacing with new the arch-sections required. I am not aware that tlrere has heretofore been a furnace constructed with arch-sections capable of such ready repair and. such enduring qualitiesr These results are obtained by constructing the arch-sections with the highlyaefractory coating integral therewith, so that if immediate repairs are required tie furnace may be cooled and the new sections placed in positlon as re quired, thus greatly avoiding loss of time in making repairs.

What I claim, and desire to secure by Letters Patent of tlze'United States, is

. 1. A. furnace provided with a grateand a forwardly 4110iined archprovided at its forwardend with a substantially hopper or V staped recess constructed to permittlre cinders to enter from the entire width of the arch and todirect them to the central portion of-tl e grate at the front tlereol.

in a furnace, a shelf havinga grate porcrease.

tion,enchor-hlocks on said shelf, and anerch, the forward end of which rests on saidblocks and is provided with an opening directly above said grate portion.

3. In diurnace, e shelf having at central grate portion and a socket on each side thereof, 9.11 arichonblock in each socket, and an inclined arch resting attics forward end on said blocks and having on opening directly above said grate portion.

4. in a iurncce, a shell having s central grate portion and e perforated socket on each side thereof, an anchor-block in each socket having it passage connnunicating with said perforation, and an inclined orcn resting at its forward end on said blocks and having;v

two passages communicating with the passages in the blocks, the forward end-of the arch being provided with an opening to register with said grate portion.

In a. furnace, a shelf having a cent-rel grate portion and e perforated socket at cech side thereof, ancncnor-blocl; in each socket heving a passage commiuricating with said perforation, and an inclined arch resting at its forward end onsaid bloclrs end havu g two fan-shaped passages communicating with the passages in saidbloclts, the forward end of said arch being provided with an opening to reg ster with said grate portion.

6. in a furnace, at shfill', two anchor-blocks resting thereon at a distance apart, the top of each of which 1s inclined, and an inclined arch formed from a series of sections, each section extending from side to side of the furnace and thefor'ward section resting on said inclined tops and provided with an opening to register with t e space between said blocks, and means for supporting the other sections.

7. A section for an arch in a furnace consisting of a, curved piece of fireproof material, each end of which is provided with a grooye and the forward side with a lug at eecn end, said section being further provided with a passage at each end which extends from the oottoin upward and rearward to the rear face.

In witnesswhereof I have signed my name to this specification, in the presence of two subscribing witnesses, at Los Angeles, California, this 3d day of April, 1903.

W lLLIAllt N W 'l'UN BEST.

Witnesses? ARTHUR P. KNIGHT, JULIA TOWNSEND. 

